hypnotist; mesmerist
A person who practices hypnosis, often in a therapeutic or entertainment context.
He appears on stage as a hypnotist.
The hypnotist guided the patient into a trance.
催眠術 refers to the technique of hypnosis itself, while 催眠術師 is the practitioner.
Compound of 催眠 (hypnosis) + 術 (technique) + 師 (master, practitioner).